Source Naturals, Systemic C tablets, 500mg, 240 TabsProduct Description Dietary Supplement Enhanced Non Acidic Vitamin C For Superior Antioxidant Protection* Product Benefits Ingredients Supplement Facts For Tablet Serving Size: 2 Tablets Amount %DV Calories 10 Total Carbohydrate 1 g <1% Vitamin C (as calcium ascorbate) 1,000 mg 1,667% Calcium (as calcium ascorbate and dibasic calcium phosphate) 150 mg 15% N Acetyl Cysteine 120 mg alpha Lipoic Acid 100 mg Quercetin 50 mg Bioflavonoids 40 mg Grape Seed